vice president joe biden was also sworn in and together they laid a wreath at the tomb of ton known soldier. it's been a weekend full of events all leading up to the ceremony at the capitol. >> we're really excited. >> reporter: 800,000 people are expected to pack the national mall and security is tight. more than 13,000 military and law enforcement officers will be on duty, with s.w.a.t. teams and biochemical response units in place. >> protecting an event this large with this many different venues with this number of people coming requires a lot of coordination. >> reporter: president obama will take the oath again on martin luther king jr.'s birthday, this time with his hand on two bibles, one that king used and one that president l lincoln used. >> you're going to see a president that wants to work across party lines to get things done. i think that's what the country wants. >> reporter: of course, you have the parade and the two big inaugural balls. but when it comes to the actual ceremony this morning, the crowd is not expected to be as large as it was during the 2009 inauguration, wh